I wanted to add after re-reading your post that this was our first experience off-site too. The hotel really is "right outside" the park on the Animal Kingdom side and getting to the parks in our rental car was a breeze! I would venture to bet we beat the commute times of the busses from our on-site stays. Very convenient!
Also, no standing in line for the bus forever, no standing while on the bus and no one's butt in your face when you are seated! Also, no long walk to and from the bus stop.
One other advantage over the Disney resorts, no freakishly long check in time. We were checked in and on our way in no time. During all 3 of our previous stays on-site, we had 30 min check in times, once it was our turn! I don't understand this since the room was pre-paid in every case. It seems like they ought to be able to hand you your keys and send you on your way. Each time the clerk would type forever, say hmmmmm, and disappear behind the counter to "talk to her supervisor". We met up with some relatives staying at the Animal Kingdom Lodge last week and they had the same experience. I don't get it!
We would definitely do the HIFS again!